Adsorption of Pentachlorophenol from Aqueous Solution on Dodecylbenzenesulfonate Modified Nickel鈭扵itanium Layered Double Hydroxide Nanocomposites

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• 作者：Zhiyue Gao ; Bing Du ; Guoyan Zhang ; Yan Gao ; Zejiang Li ; Hui Zhang ; Xue Duan
• 刊名：Industrial & Engineering Chemistry Research
• 出版年：2011
• 出版时间：May 4, 2011
• 年：2011
• 卷：50
• 期：9
• 页码：5334-5345
• 全文大小：1269K
• 年卷期：v.50,no.9(May 4, 2011)
• ISSN：1520-5045

文摘

Dodecylbenzenesulfonate (DBS) modified Ni_RTi layered double hydroxides (LDHs) with different Ni/Ti molar ratios were prepared as hydrophobic organics sorbent by one-step co-precipitation method. The basal spacing of DBS鈭扤i_RTi (d₀₀₃ = 2.99鈭?.54 nm) is significantly increased compared with cyanate-intecalated Ni₅Ti鈭扡DH (0.73 nm) due to the intercalation of surfactant anions between the LDH layers. The greatly enhanced contact angle (123.5鈭?44.2掳) for water and the reduced surface area (1.72鈭?.25 m²/g) of DBS鈭扤i_RTi nanocomposites demonstrate their strong hydrophobic property. The highest sorption capacity for pentachlorophenol (PCP) of DBS鈭扤i₅Ti among all samples is intimately related to its stacking model of the interlayer hydrophobic moiety and organic carbon content. The linear model well-fits for PCP sorption isotherms on DBS鈭扤i_RTi (R² > 0.96), implying a partitioning sorption process. Along with the effect of medium pH and temperature on PCP sorption鈭抎esorption study on DBS鈭扤i₅Ti, an adsolubilization mechanism, an exothermic sorption nature, and a significant hysteresis phenomenon during sorption鈭抎esorption process are revealed.